add vendor

vendor/gopkg.in/mgo.v2/txn/tarjan_test.go

@@ -0,0 +1,44 @@
+package txn
+
+import (
+	"fmt"
+	"gopkg.in/mgo.v2/bson"
+	. "gopkg.in/check.v1"
+)
+
+type TarjanSuite struct{}
+
+var _ = Suite(TarjanSuite{})
+
+func bid(n int) bson.ObjectId {
+	return bson.ObjectId(fmt.Sprintf("%024d", n))
+}
+
+func bids(ns ...int) (ids []bson.ObjectId) {
+	for _, n := range ns {
+		ids = append(ids, bid(n))
+	}
+	return
+}
+
+func (TarjanSuite) TestExample(c *C) {
+	successors := map[bson.ObjectId][]bson.ObjectId{
+		bid(1): bids(2, 3),
+		bid(2): bids(1, 5),
+		bid(3): bids(4),
+		bid(4): bids(3, 5),
+		bid(5): bids(6),
+		bid(6): bids(7),
+		bid(7): bids(8),
+		bid(8): bids(6, 9),
+		bid(9): bids(),
+	}
+
+	c.Assert(tarjanSort(successors), DeepEquals, [][]bson.ObjectId{
+		bids(9),
+		bids(6, 7, 8),
+		bids(5),
+		bids(3, 4),
+		bids(1, 2),
+	})
+}